Improve consistency for the API documentation comments
Improve consistency for the API documentation comments

Over time we used multiple different formats for JSDoc comments. This
commit standardizes those formats to the one we used most often.

Moreover, this removes the example in the outline endpoint documentation
since it now has a proper type definition and it didn't render correctly
in JSDoc.

mozilla/pdf.js,timvandermeij/pdf.js,macroplant/pdf.js,caremerge/pdf.js,caremerge/pdf.js,Snuffleupagus/pdf.js,mozilla/pdf.js,Snuffleupagus/pdf.js,macroplant/pdf.js,nawawi/pdf.js,nawawi/pdf.js,Shoobx/pdf.js,xavier114fch/pdf.js,macroplant/pdf.js,showpad/mozilla-pdf.js,xavier114fch/pdf.js,showpad/mozilla-pdf.js,Shoobx/pdf.js,timvandermeij/pdf.js,Shoobx/pdf.js,nawawi/pdf.js,showpad/mozilla-pdf.js,mozilla/pdf.js,timvandermeij/pdf.js,Snuffleupagus/pdf.js